Rollup merge of #74143 - pickfire:patch-2, r=jonas-schievink
Rollup merge of #74143 - pickfire:patch-2, r=jonas-schievink

Try remove unneeded ToString import in liballoc slice

graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust